Which symptoms are typically associated with crop injury from the herbicide 2,4-D?

The symptoms associated with crop injury from the herbicide 2,4-D primarily include epinasty and leaf yellowing. Epinasty refers to a condition in which the plant's growth causes the petioles of the leaves to elongate, resulting in the leaves bending downward. This is often seen under the influence of certain herbicides like 2,4-D, which disrupt normal plant growth patterns due to their hormonal effects. Additionally, leaf yellowing is another common symptom, indicating stress and damage to the plant’s physiological processes.

Understanding the specific effects of 2,4-D is crucial for recognizing herbicide injury, as different herbicides can cause varying symptoms in plants. The symptoms of chlorosis and necrosis involve tissue death and can be caused by various stress factors, but they are not the hallmark signs of 2,4-D injury. Similarly, root rot and stunted growth are associated with issues such as overwatering or soil pathogens, while wilting and browning of leaves typically relate to drought stress or disease, thus making them less specific to 2,4-D exposure. Understanding these typical symptoms allows for better identification and management of herbicide-related crop injury.